Glass



I Patented May 15, 1928; I i A UNITED STATES PATENT OFFICE.

BERNARD LONG, 01 PARIS, FRANCE, ASSIGNOR T0 SOCIETE ANONYME DES MANU- FACTURES DES GLACES & PRODUITS CHIMIQUES DE SAINT-GOBAIN, CHAUNY '85 CIREY, OF PARIS, FRANCE;

GLASS.

No Drawing. Application filed January 1 2, 1926. Serial No. 80,839.

Cheaper grades of glass Such as used f r Under my invention I would incorporate 25 sheet glass, vault-lights, etc., are generally therein a small quantity, say two to three pernaade I't E ge klown :1 l? s cent of oxide of lead. The substitution in 2 assesas en Pequen y 0 Serve question may be made by replacin a iven 5 that these glasses: although colorless when percentage of the silica, alkali or bgse (3 f the first made become pink or yellow whensubb jected to sunlight. I have discovered that 8 glass wlth an equal percentage of the this change of tint 1n glasses of this type is Applicant on October 1927 filed an p plication making claims'generic to the use of due to the action of shorter wave lengths m I I I contained 1n the sunhght in causing new 18a d and tltamum x deg d pec fic s to 35 titanium oxide.

combinations of oxygen in the glass with Having thus described my invention What metallic bases found therein, such as iron, d that thi can b id d b i t I claim and desire to secure by Letters Patmanganese and selenium, and have discov- 15 ing in the glass a small quantity of oxide of ent is l d A soda lime glass having metallic elements Consider a well known glass such as the therein which is aifected by waves of short following lengths and containing not over 3% of oxide Per cent of lead. I 20 9 In testimony whereof I hereunto afiix my :6 signature.

This glass is liableto color changes under BERNARD LONG.

the conditions above stated. 

